The conodont fauna from the Willara Formation, a carbonate-dominated stratigraphic unit widely distributed in the subsurface Canning Basin of Western Australia, is represented by 41 species, including a new species, Erraticodon neopatu Zhen n. sp. The Jumudontus gananda and Histiodella altifrons biozones are recognized in the lower and upper parts, respectively, of the Willara Formation. Deposited primarily in shallow nearshore settings, the Willara Formation is characterized by the occurrence of predominantly long-range coniform species of Triangulodus, Scalpellodus, Drepanoistodus, Drepanodus, and Kirkupodus. Several widely distributed age-diagnostic species, including Histiodella altifrons, Histiodella holodentata, Histiodella serrata, and Jumudontus gananda, serve as keys for biostratigraphic analysis and correlation. Our study also shows that the basal and top boundaries of the Willara Formation are diachronous across the basin, extending from the middle Floian (Oepikodus communis Biozone) to middle Darriwilian (Histiodella holodentata-Eoplacognathus pseudoplanus Biozone). This contribution provides crucial new biostratigraphic data for precise correlation of the Willara Formation with its time equivalents regionally and internationally.

Willara 组牙形石动物群是广泛分布于西澳大利亚地下坎宁盆地的一个以碳酸盐为主的地层单元，共有 41 种，其中包括新种Erraticodon neopatuzhen n。sp. 的Jumudontus gananda和Histiodella altifrons生物带在所述下部和上部分别认识到，所述Willara形成的。Willara 组主要沉积在近岸浅水环境中，其特征是主要分布有Triangulodus、Scalpellodus、Drepanoistodus、Drepanodus和Kirkupodus的远距离锥状物种。几种广泛分布的年龄诊断物种，包括Histiodella altifrons、Histiodella holodentata、Histiodella serrata和Jumudontus gananda是生物地层分析和相关的关键。我们的研究还表明，Willara 组的基底和顶部边界贯穿整个盆地，从弗洛亚中部 ( Oepikodus community Biozone)延伸到Darriwilian 中部 ( Histiodella holodentata - Eoplacognathus pseudoplanus Biozone)。这一贡献提供了重要的新生物地层数据，用于将 Willara 组与其在区域和国际上的时间当量进行精确关联。